zrlw edited a comment on issue #9239:
URL: https://github.com/apache/dubbo/issues/9239#issuecomment-964884504
dubbo-samples的dubbo-samples-applevel-override就能稳定重现：
1. CuratorZookeeperClient的344行设置断点
```
} else if (childData.getStat().getVersion() == 0) {
content = new String(childData.getData(), CHARSET);
eventType = EventType.NodeCreated; <== line 344 set
breakpoint here
} else {
```
2. 启动zk服务，端口2181
3. debug启动BasicProvider, 启动参数加dubbo.port=20880
4. debug启动BasicProvider, 启动参数加dubbo.port=20881
5. 在ZKTools的66行设置断点：
```
if (client.checkExists().forPath(path) == null) {
client.create().creatingParentsIfNeeded().withMode(CreateMode.PERSISTENT).forPath(path);
<== line 66 set breakpoint
}
```
6. debug执行DemoServiceIT单元测试
7.
一直执行到DemoServiceIT到达ZKTools的66行断点处（出现CuratorZookeeperClient的344行断点时继续执行即可），之后单步执行完66行，两个provider都会再次执行到CuratorZookeeperClient的344行的断点处，此时查看两个provider的事件content内容就会看到里面都只是一个ip地址。
重复上述测试要先重新debug启动两个provider，再debug启动DemoServiceIT，否则到不了ZKTools的66行断点。
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